Drywall Square Overhead Support

So, I discovered that trying to draw a straight line on the ceiling requires at least one more hand that I came equipped with from the factory. Seems that holding both ends of a drywall square while drawing a line along the edge required some thought.

So, I thought, and modelled, and thought, and revised, until I got to this thing. It's designed to fit on a Harbor Freight drywall square but _should_ fit most brands. if not, it's a relatively easy model to "fix" or recreate.

Requires 2 M4 screws, 30mm or so. They thread into the holes and function as a clamp to hold the "third hand" on the square.